It may not win awards for minimalist attractiveness, but it can be hugely helpful to anyone whose sight makes it difficult to see the letters on the keyboard.
Yellow keys with black letters are actually the easiest color combination for people to see, but if you're opposed to the combination for aesthetics, they also have black-on-white and white-on-black. The keyboards are available from firstSTREET, a site that sells products and gadgets "For Boomers and Beyond." The keyboard costs $50.
-As seen over on popgadget.